Maria Camarca

Callisto from JWST: CO 2 -rich Terrain on the Leading Hemisphere and Global Patterns of H 2 O Ice

Maria Camarca, Katherine de Kleer, Richard Cartwright, Geronimo Luis Villanueva et autres

Abstract We present maps of H 2 O, CO 2 , and a 4.57 µ m spectral feature across Callisto’s surface observed using the James Webb Space Telescope (JWST). H 2 O ice was mapped by measuring band parameters of the 3.1 …

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Variability of Europa’s Optical Aurora on Orbital and Multiyear Timescales

Zachariah Milby, Katherine de Kleer, Carl Schmidt, Maria Camarca

Abstract Europa’s auroras result from interactions between its tenuous atmosphere and the exogenous electron population trapped within Jupiter’s magnetosphere. In this study we analyzed spectra of Europa’s optical wavelength aurora taken during eclipse by Jupiter over 10 nights between 2021 and 2025 …

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Revealing Callisto’s Near-subsurface Thermophysical Properties with ALMA Calibration Data

Cole Meyer, Maria Camarca, Katherine de Kleer, Alexander E. Thelen et autres

Abstract Thermal images at different wavelengths probe varying subsurface depths of planetary bodies and therefore can inform us about their compositions, thermophysical properties, and impact histories. We identified six archival observations of Callisto obtained by the Atacama Large Millimeter/submillimeter Array (ALMA) between …

A Multifrequency Global View of Callisto’s Thermal Properties from ALMA

Maria Camarca, Katherine de Kleer, Bryan J. Butler, Alexander E. Thelen et autres

Abstract We present thermal observations of Callisto’s leading and trailing hemispheres obtained using the Atacama Large Millimeter/submillimeter Array (ALMA) at 0.87 mm (343 GHz), 1.3 mm (233 GHz), and 3 mm (97 GHz). The angular resolution achieved for these observations ranged from …

A multi-frequency global view of Callisto's thermal properties from ALMA

Maria Camarca, Katherine de Kleer, Bryan J. Butler, Alexander E. Thelen et autres

We present thermal observations of Callisto's leading and trailing hemispheres obtained using the Atacama Large Millimeter/submillimeter Array (ALMA) at 0.87 mm (343 GHz), 1.3 mm (233 GHz), and 3 mm (97 GHz). The angular resolution achieved for these observations ranged from 0.09-0.24 …

CO2-rich terrain on Callisto’s leading hemisphere and a global dichotomy in Callisto’s H2O ice as seen with JWST

Maria Camarca, Katherine de Kleer, Richard Cartwright, Geronimo Luis Villanueva et autres

Background:As though it were frozen in time, Jupiter’s moon Callisto has seemingly done little more than collect and degrade impact craters.1 This contrasts with other big icy moons in the solar system (e.g., Ganymede, Titan, Europa), which bear evidence for either past …

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Revealing Callisto’s Carbon-rich Surface and CO 2 Atmosphere with JWST

Richard Cartwright, Geronimo Luis Villanueva, Bryan J. Holler, Maria Camarca et autres

Abstract We analyzed spectral cubes of Callisto’s leading and trailing hemispheres, collected with the NIRSpec Integrated Field Unit (G395H) on the James Webb Space Telescope. These spatially resolved data show strong 4.25 μ m absorption bands resulting from solid-state 12 CO 2 …

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Subsurface Thermophysical Properties of Europa's Leading and Trailing Hemispheres as Revealed by ALM

A. E. Thelen, Katherine de Kleer, Maria Camarca, Alex B. Akins et autres

We present best-fit values of porosity -- and the corresponding effective thermal inertiae -- determined from three different depths in Europa's near-subsurface (~1-20 cm). The porosity of the upper ~20 cm of Europa's subsurface varies between 75-50% ($Γ_{eff}\approx50-140$ J m$^{-2}$ K$^{-1}$ s$^{-1/2}$) …

Subsurface Thermophysical Properties of Europa’s Leading and Trailing Hemispheres as Revealed by ALMA

Alexander E. Thelen, Katherine de Kleer, Maria Camarca, Alex B. Akins et autres

Abstract We present best-fit values of porosity—and the corresponding effective thermal inertiae—determined from three different depths in Europa’s near-subsurface (∼1–20 cm). The porosity of the upper ∼20 cm of Europa’s subsurface varies between 75% and 50% (Γeff ≈ 50–140 J m−2 K−1 …

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Revealing Callisto's carbon-rich surface and CO2 atmosphere with JWST

Richard Cartwright, Geronimo Luis Villanueva, Bryan J. Holler, Maria Camarca et autres

We analyzed spectral cubes of Callisto's leading and trailing hemispheres, collected with the NIRSpec Integrated Field Unit (G395H) on the James Webb Space Telescope. These spatially resolved data show strong 4.25-micron absorption bands resulting from solid-state 12CO2, with the strongest spectral features …

Thermal Properties of the Leading Hemisphere of Callisto Inferred from ALMA Observations

Maria Camarca, Katherine de Kleer, Bryan J. Butler, Alex B. Akins et autres

Abstract We present a thermal observation of Callisto's leading hemisphere obtained using the Atacama Large Millimeter/submillimeter Array at 0.87 mm (343 GHz). The angular resolution achieved for this observation was ∼0.″16, which for Callisto at the time of this observation (D ∼ …

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The Optical Aurorae of Europa, Ganymede, and Callisto

Katherine de Kleer, Zachariah Milby, Carl Schmidt, Maria Camarca et autres

Abstract The tenuous atmospheres of the Galilean satellites are sourced from their surfaces and produced by a combination of plasma-surface interactions and thermal processes. Even though they are thin, these atmospheres can be studied via their auroral emissions, and most work to …

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